Make Every Drop Count with Our Rainwater Harvesting Calculator
Curious how much water you could collect from your roof? This simple tool does the math for you. Just enter your roof size, local rainfall, and collection efficiency to see how many gallons you can harvest each season or year.

It’s a quick way to plan your barrels, cisterns, or garden irrigation setup—and a great step toward self-sufficiency and lower water bills.

Rainwater Harvesting Calculator